A while back I moved my 10T-SR from its Accustock into a chassis. During the process, I changed the recoil lug to a pinned style. Now I want to put it back into the original Accustock which requires using the factory non-pinned Accustock lug.

I observed that the non-pinned lug rotates when tightening the barrel nut. Two questions:

1. Is there a recommended method for properly clocking the non-pinned lug when installing the barrel?
2. How far off top dead center can the lug be rotated before it starts to affect performance?

Maybe it's as simple as using an index mark and good old fashioned trial and error but figured I would ask. I have also considered grinding a pinned lug to match the dimensions of the Accustock lug but wanted to try to reuse the original one first.